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We were independently checking ReservedBackends < MaxConnections and max_wal_senders < MaxConnections, but because walsenders aren't allowed to use superuser-reserved connections, that's really the wrong thing. Correct behavior is to insist on ReservedBackends + max_wal_senders being less than MaxConnections. Fix the code and associated documentation. This has been wrong for a long time, but since the situation probably hardly ever arises in the field (especially pre-v10, when the default for max_wal_senders was zero), no back-patch. Discussion: https://postgr.es/m/28271.1520195491@sss.pgh.pa.us
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.